Drilling machine



G. H. GILMAN DRILLING MACHINE Filed Feb. 25, 1920 2 Sheets-Sheet 2 v In ve iop-v v Geowqelf. 6m, my t y itys.

Patented Nov. 2, i925.

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Tfr i 1a 'mia TUF. i irri i This? GEORGE H. GILLN, OF BOSTON, MASSACHUSETTS.

DRILLING MACHINE.

Application led February 25, 1920. Serial No. 361,170.

My invention relates to drilling machines and particularly, but not exclusively, to those in which the drilling tool is operated linearly and angularly by means of separate motors.

My invention will be liest understood from the following description when read in the light ot the accompanying drawings or one specific embodiment ot' my invention subm`tted ifor illustrative purposes, while the scope oit my invention will be more particularly pointed out in the appended claims.

ln the drawings:

Fig. l shows a transverse section of the submitted embodiment ot my invention;

Figs. 2 and 3 respectively are sections on the lines 2 2 and 3 3 ot Fig. l;

Fig. d is a section on the e 1 4; of

YFi I. 5 is a section on the line of Fig.

i 6 is a section on the line 6 6 of In the submitted embodiment ot my invention l provide a drill steel. which I operate linearly by percussive action imparted by a hammer piston and angularly by imparting thereto rotation by means ot' a rotary motor.

The piston just referred to l provide with an enlarged head l and with oppositely ei:- tending stein portions 2 and 3 or" reduced diameter. yEhe piston l mount `tor reciprocation within a cylinder structure having .'25 bores which lit the head l and the stems 2 and the cylinder and piston thereby providing the expansible chambers l 5 and G to which motive fluid may be admitted to act on the eiiective areas of the piston to move it.

For supplying motive fluid I have shown a conduit 7 adapted when the machine is in operation to be permanently connected with t ie source ot motive fluid supply. rhis conduit herein communicates with an annular groove 8 formed adjacent the front end of thc bore receiving the rearwardly extending stein f5 of the piston. rlhe stem Sin my submitted embodiment is subjected continuously to the pressure of the motive fluid and -lor causing this l herein connect the rearward end or' the bore receiving the stein to the groove 8 by means ot conduits 9 formed in the wall ofthe cylinder.

"Eh-emotive duid acting on the rear .end ot fio the stem 3 will move the piston forwardly andto return the piston herein provide suitable conduits l0 which communicate at one end with the forward portion oi the bore receiving the head of the piston and at the other end with the bore receiving the stein 3. ln the submitted embodiment ot my in vention tour such conduits are shown, thc same being arranged in pairs, the forward and rearward ends respectively et each pair communicating with arcuate grooves ll .f .L

iorined in the large bore oi the cylinder and arenal grooves l2 termed in the small bore. I Y' vVhen the' piston moves torwardly the rea' end of the stem 3 uncovers the grooves 'lf2 and thereby transfers motive fiuid from the expansible chamber lto the expansible chamber G and as the eiiectivc crosssectional area ol: the forward portion ot the head is greater than that of .the rearward end ot the stem 3, the piston returns by ditterential action ot the motive fluid.

For augmenting the supply to the conduits l0 I herein have provided a motive iluid supply passage or conduit 141- which in the submitted embodiment of my invention communicates with the live air conduit 7 and with the eXpansible chamber l at suoli a point that when the grooves l2 tor the duits l() are open, the conduit la is permitted to supply motive fluid to the expansible chamber 4 whence'it passes into the expansible chamber 6. Vilith the conduits arranged as described, wire drawing ot the iluid passing into the expansible chamberis prevented when the conduits l() are open, it being noted that the passage 14 provides a much shorter path tor the motive iluid than that entering the chamber through the passages 9.

Preferably although not necessarily l. admit motive fluid to the ei chamber 5 when the piston is in its r. l position to increase the torce oit the blow imparted to the drill steel. For this purpose I have shown the forward portion of the stem 3 oi reduced diameter as indicated at i3. .et-.s may be determined from Fig. l when the piston is in its rearward position, communication is established between the groove 8 and the expansible chamber 5 which aids the motive fluid acting on the rearward stein 3 of the piston to torce the piston forwardly.

For exhausting motive fluid from the chanibersy vand 6 I herein provide an er.-

haustport 15 which in the present embodiment of my invention is so ocated as to be overrun by the piston.

In the submitted embodiment of my invention, at the rear of the cylinder section receiving the large head of the piston is a cylinder section 17 which is exteriorly reduced to form a rearwardly extending sleeve 16 and in which is formed a bore receiving and serving as a cylinder for the rearwardly extending stem As shown the forward end of the cylinder section 17 is provided. with a cylindrical part 17d which enters the bore of the adjacent cylinder section, while the portion of the cylinder section 1.7 between the part 17 and the reduced portion 16 forms fiange abutting the end of the adjacent cylinder section. For closing. the rearward end of the cylinder I herein provide a rear cylinder head 18 which herein tits over the end of the sleeve 16 and is mounted inspaced relation with the body portion of the cylinder section 17 by means of the motor casing 19. For supporting the machine I may provide a handle 2O herein carried by the rear' head 18. For supporting the drill steel I provide a chuck 21, which in the present embodiment 0f my invention I rotate by means of a rotary type motor mounted in the casing 19.

In the submitted embodiment of my invention the rotary type motor above referred t0 comprises a central gear member 22 having the large gea-r teeth 22 and smaller gear teeth 22'), and meshing therewith gear members 23 located at the side thereof. The central gear member 22 I have shown as rotatably mounted on the exterior of the sleeve 16, and as shown the motor is of a known type in which the large gear teeth 22 of the central gear tit the inner annular wall of the motor casing 19 and serve as pistons for converting the energy of the pressure fiuid into work, the gear members 23 serving as rotary abutments for the air acting on the pistons and having recesses 23a permitting the pistons to pass by them. This motor as shown is provided with inlets 24: which communicate with passages 25 having ports 26 communicating with the rearward end of the expansible chamber 4. The motor is further shown as provided with outlet ports 27 which communicate with passages 28 dis'- charging to the atmosphere through ports It will be noted from the above construction that so long as motive Huid of sutilcient pressure is admitted to the rearward end of the expansible chamber t the rotary motor for rotating the chuck will operate, the air acting on the pistons 22 causing the cent-ral gear or rotary piston member 22 to rotate and the latter imparting itsrotation to the side 4'gears or abutments 23. It will also be observed that thesterli 3 of the' piston on' itsv rearward stroke" raises'tlie pressure'of the air in the expansible chamber 4 and consequently increases the mean pressure of the motive fluid supplied the rotary motor.

I have found that it is of considerable ad vantage to supply the chuck rotating motor with motive fluid from a point between the motive iuid supply connection and the coni duit means effective to conduct the motive Huid compressed by the rearward stem of the piston to the motive fluid supply connection. Herein the passages S) which connect the rearward end of the small bore of the cylinder to the motive fluid supply connection are preferably made as large as practical without unduly weakening the parts or increasing the size of the machine, but no mattei' how large they are made they do not appear to prevent a material compression of the motive fluid in the small bore of the cylinde1 when the piston makes its return stroke` This I believe is due t0 the high speed of the piston. Therefore this portion of the cylinder is substantially in restricted communication with the source of motive fluid supply solely by way of the passages 9 when the piston makes the final part of its rearward stroke.

Surrounding the chuck I have shown a chuclf` casing 30 which herein provides a forward exterior bearing 31 for the chuck. At the rearward end of the chuck I have heiein provided a reduced portion 32 having an exterior bearing 33 at the end of the cylinder. For operatively connecting the motor and the chuck, I have shown shafts 34 which herein are driven by the gear members 23 secured thereto by keys 35. Preferably I provide a reduction gearing for operatively connecting the shafts and the chuck. .F or this purpose herein I form on the exterior rearward portion of the chuck 2l gear teeth 36 adapted to mesh with gear teeth 3T formed on the yoke member 38 which surrounds the chuck. For operating the yoke member I have shown eccentric members 39 driven by the shaftst, these eccentric members cooperating with the strap portions 4:0 of the yoke to gyrate the latter and thereby roll its toothed portion about the toothed portion of he chuck. By this means a powerful reduction gearing is provided.

Suitable bearings for the shafts may be provided. In the submitted embodiment." four such bearingsare provided for each sha-ft, nal'nely those provided by the sleeve bearing 41 and the anti-friction bearing 42 respectively carried by the cylinder section and the main port-ion of the cylinder and the endbearings 4:3 and 44 respectively carried by the rear head 18 and the chuck cas ing 30.

As' jwill be readily understood by thosev skilled in'this art, sludge, waterand 'other v tort-nen material may find its way into the @hesiter-'45 vi nieuwe. rer afnam-g' @a such material l may provide a suitable drainage passage which in the present embodiment oi my invention is illustrated by the passage 4G leading to the atmosphere. lis will be obvious', the passage 46 vvill also serve as breather passage for the chamher 45 and thereby prevent, when the passage is connected to the atmosphere, a substantial increase or diminution or" pressure in the chamber shove or heloiv the atmospheric pressure.

fluid is led e atn'iosphere. As Will be readily noted, 'Ehe exhaust fluid admitted from the port 15 into the passage 46 tends to torce any mater'al that may collect in the passac'e to the atmosphere.

ns is usual with the type oi" machine herein submitted as illustrating my invention, l may conduct cleansing fluid to the Work to cleanse the same. For this purpose, I herein provide the drill steel vfith the bore 4T which extends trom the chamber 45 of the chuck to the cutting' end oiflthe steel. For conducting cleansing fluid to the bore of the steel, l provide a suitable tube 4S which in the present embodiment of my invention is mounted in the rear cylinder1 head 18 and extends axially through the machine to the bore ot the steel. is will be appreciated, it the air pressure in the chamber 45 is caused to build up air will be discharged trom said chamber into the bore 4'? and hence to the worlr. This may be done ior example either by admittinglive air to the cnamber or hy restricting the discharge end ot' the passage Preferably but not necessarily l employ mechanism which secures both ot these results, vvhich mechanism will now be described.

For controlling the supply of motive fluid to the motors, the supply to the Work and the exhaust and breather passages, l may use valvular mechanism which in the present en'ilaoiliment of my invention takes the form oi? a 'valve 49 so constructed as to coordinately control the conduits just indicated. rlhis valve l have shown mounted in a casing carried by the cylinder section is illustrated, the valve employed for purpose is a conical turning plug havan interior chamber 50 supplied with :fluid by means of the connection 51. plug is further provided with a sidep ln the casing tor the valve are l three ports 53, 54 and 55, respecvelv connecting' With the intake passage 7 aiding to the percussive motor, he comhined exhaust and breather passage 46 and the atmosphere. Leading from the interior chamber 50 oit the valve to its exterior surface is a port 56.

ln the position of the 'valveshown hy course causin up in the cha steel. he port if' when this taires plate` be supplied to the pts pereussive motor. i passage 55 thus descr the hole, of course, to some the percuss"'o motor and decreases the blov: on the steel.

Under some conditions, it is desirable to conductlive air at high pressure to the Work. F or this ourpose, l may turn the valve as vievved in l* 2, in a couiitei'-cloclr Wise direction so as to interi-rpt the communication between the passage and the atmosphere and to connect said passage With the port 56 so that. live air may be supplied thereto. ris vvill be obvious, under these conditions, the percussive motor will not operate. ln order that under these conto the drill Width that continue to ding' to t ditions the drill steel may be rotated, l may so iiorin the port 5G ot the valve that when it supplies fluid to the passage just described, it will also supply iiuid to the passage 53 whence it may pass to the chuclr rotating motor through the conduit l and the passages 9 and 25.

For suitably holding` the parts ot the machine in assembled relation, l may provide bolts 57, four oit Which are shown in the suhmitted embodiment of my invention. These bolts extend 'trom the chucl casing;` to the rear head 18.

In respect to the means for rotating' the chuck the roel; drill disclosed herein constitutes an improvement over the inventions disclosed in my copcnding applications Serial No. 350,57?, liled January 1U, 1920, Serial No. led nuary 28, 1920, and Serial No. 355,494, iilet. January 1, 1920.

Although l have disclosed a bodiment of my inve-ntie;A `for purposes of illustration it is to be understood that invention is not limited to said embodiment and that Wide deviations may be made therefrom TWithout departing' trom the spirit of my invention. Y

Claims.

1. ln a drilling machine, ay cylinder, piston having a head and a rearwardly estendspecific fdl itil

ing portion, a chuck, a chuck rotating motor, said motor surrounding said portion. and means operatively connecting said motor and chuck.

In a drilling machine, a cylinder, a piston having a head and a plurality ot extending portions, a chuck, a chuck rotating motor, gearing means operatively connecting said motor and chuck, said motor surrounding one ot said port-ions and said gearing surrounding another of said portions.

In a drilling n'iachine, a cylinder, a piston having a he-ad and a rearwardly extending portion, a chuck, a chuck rotatii g motor of the rotary type, said motor surrounding said portion, and means operatively connecting said motor and chuck.

Il. In a drilling machine` a cylinder, a piston having a head and a plu ality ot extending portions, a chuck, a chuck rotating motor of the rotary type, gearing means operatively connecting said motor and chuck. said motor surrounding one ot said portions, and said gearing surrounding another of said portions.

5. In a drilling machine, a cylinder, a piston having a head and a rearwardly extending portion, a chuck, a chuck rotating motor comprising a rotary member tor converting the energy et pressure fluid into Work, said rotary member surrounding said portion, and means operatively connecting said Inotor and chuck.

6. In a drilling machine, a cylinder, a piston having a head and a plurality of extending portions, a chuck, a chuck rotating motor comprising a rotary member for con verting the energy of pressure fluid into Work, gearing means operatively connecting said rotary member and chuck, said rotary member surrounding one ol said portions l l l gearing surrounding another of said portions.

7. In a drilling machine, a cylinder, a piston having a head and an extending portion, a chuck, a chuck rotating motor, said motor` surrounding said portion, means operatively connectin,v said motor and chuck, said portion providing a pressure surface, and means for admitting' motive fluid to said cylinder to exert a pressure on said surface.

1%?. In a drilling machine, a cylinder, a piston having a head and an extending portion, a chuck. a chuck rotating motor, said motor surrounding said portion, means operatively connecting Ysaid motor and chuck, conduit for admitting motive fluid to said cvlindm, conduit means tor exhausting such nio rife tluid, and one of said conduit means being controlled by said portion.

l). In a drilling machine, a cylinder, a piston having a head and an extending portion, a chuck, a. chuck rotating motor of the rotary type, vsaid motor surrounding said portion,

means operatively connecting said motor and chuck, said portion providing a pressure surtace, and means tor admitting motive fluid to said cylinder to exert a pressure on said surface.

l0. In a drilling machine, a cylinder, a piste-n having a head and an extending portion, a chuck, a chuck rotating motor comprit-nig rotary member tor converting the energy of pressure 'Huid into Work, said rotary inen'iber surrounding said portion, means operatively connecting said motor and chuck, said portion providing a pressure surface., and means for admitting motive fluid. to said cylinder to exert a pressure on said Surface.

11. In a drilling machine, a cylinder, a piston having a head and an extending portion, a chuck, a chuck rotating motorI ot the rotary type, said motor surrounding said portion, means operatively connecting said motor and chuck, conduit means for admittin@ motive fluid to a portion of the cylinder for operating said piston, conduit means for exhaustingsuch motive fluid, and one of said (enduit means being controlled by said portion.

l2. In a drilling machine, a cylinder, a piston having a head and an extending portion, a chuck, a chuck rotating motor comprising a rotary member for converting the energy oi pressure fluid into Work, said rtary member surrounding said portion,

-means operatively connecting said motor and chuck, conduit means for admitting motive fluid to a portion of the cylinder for operating said piston, conduit means ,for eX- hausting such motive fluid, and one of said conduit means being controlled by said portion.

13. In a drilling machine, a cylinder, a piston having oppositely extending portions, a chuck, a chuck rotating motor, gearing operatively connecting said motor and chuck, said motor surrounding one oi' said portions, and said gearing surrounding the other portion and said chuck.

In av drilling machine, a cylinder, a piston having a portion ot reduced diameter, a chuck, a chuck rotating motor, means operatively connecting said motor and chuck, said motor surrounding said portion ot reduced diameter, and means cont-rolled bj said portion for admitting motive fluid to a portion ot said cylinder for operating the piston in one direction.

l5. In a drilling machine, a cylinder, a piston having a head and oppositely extending portions, a. chuck, a chuck rotating motor surrounding one ot' said portions, a gearing surrounding the. other of said portions, and a shaft operatively connecting said motor and gearing.

c. 16. In aL drilling machine, a cylinder, a

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piston having a head and oppositely extending portions, a chuck, a chuclrrotating motor ot' the rotary Itype and adapted to surround one of said portions, a. gearing ada-pted to surround the other oil said portions, and a shaft operatively connecting said motor and gearing.

17, ln a drilling machine, a cylinder, a piston having a head and oppositely extending portions, a` clinch, a chuck rotating motor comprising a rotary member' for oonverting the energy ot pressure liuid into worlc, said rotary member surrounding one oi said portions, a gearing surrounding the other of said portions, and a shaft operatively connecting said motor and gearing.

l8. ln a drilling machine, a cylinder, a

` piston having a head and oppositely entending portions, a chuck, a chuck rotating motor comprising a rotary member for coning the energy or pressure fluid into worn surrounding one of said portions, a member transversely disposed with relation to said rotary member and operativ-ely connected therewith, a gearing surrounding the other or' said portions an d a shaftoperatively connecting said member and gearing.

19. ln a drilling machine, a. cylinder, a piston having a head and oppositely eX- tending portions, a chuck, a chuclt rotating motor comprising a rotary member for converting the energy of pressure duid into work surrounding one of said portions, a gear operatively con ected with said rotary member, a gearing surrounding the other of said portions, and a shaft operatively connecting said gear and gearing.

20. ln drilling machine, a cylinder, a iston having a head and oppositely extendr portions, a chuck, a chuck rotating moine' one oi said portions, a plurality oi' roy members forming with the iirst mentiored rotary member a plurality of eX- is ile chambers, a gear connection ben said iirst mentioned rotary member d each oi said plurality of rotary mems, reduction gearing surrounding the other or said portions, and shafts connectng each of said plurality of rotary members o sail gearing.

L. ln a drilling machine, a piston having r arward extension, a drill steel for operaion oy said piston, a motor for rotating said ate l l aving a rotary memberl for converting die energy of pressure fluid into work surounding said extension, and means operatively connecting said rotor and steel.

22. ln a drilling machine, a piston having head and a rearward extension, a drill steel for operation by said piston, a rotary motor `for rotating said steel, said motor being located rearwardly of said head and having a rotary part in substantially axial tor comprising a rotary member surround-v alignment therewith, and means including a forwardly extending shaft at the side of said head operatively connected to said motor and a gyratory yoke in substantially axial alignment with said steel driven by said shaft for operatively connectingsaid motor and steel.

28. ln a drilling machine, a piston having a head and a rearward extension, a drill steel *for operation by said piston, a motor for rotating said steel located rearwardly of said head and comprising means including a pair of rotary members forming an expansible chamber one or" which members is in substantially axial alignment with said head, and means including a forwardly ei;- tendingshaft at the side of said head and a gyratory yolre in substantially axial alignment with said steel driven by said shaft for operatively connecting the other oi' said rotary members and steel.

24. ln a drilling machine, a piston having a head and a rearward extension, a drill steel for operation by said piston, a motor for rotating said steel and located rearwardly of said head in axial alignment with said steel, and means including a forwardly ei;- tending shaft at the side ol said head operatively connected to said motor and a gyratory yoke in substantially axial alignment with said steel driven by said shaft for operatively connecting said motor and steel.

25. ln a drilling machine, a piston having a head and a rearward extension, a drill steel for operation by said piston, a motor `for rotating said steel and located rearwardly of said head, said motor having means including` a pair of gears forming an expansible chamber one oi which gears is located in substantially axial alignment with said steel, a forwardly directed shaft for rotating said steel directly driven by the other oi said gears, an eccentric driven by said shai't, and a gyratory yoke in substantially axial alignment with said steel driven by said eccentric.

26. In a drilling machine, a cylinder having a piston provided with an es* i 3, a drill steel, and a motor :for rotating said steel compr'sing the annular lluid pressure actuated member 22 formed to permit said extension to pass through it.

27. In a drilling machine, a piston having` a rearward extension, cylinder, a motor having a rotary member for converting the energy of pressure fluid into wozlr surrounding said extension, a shaft extending through said cylinder and operatively connected said rotary member, a drill steel, and gea ing driven by said shaft io: rotating said steel.

28. ln a drilling machine, a piston having the extension 3, a motor having the D@ and 23, one ot said gears being formed to permit said extensionto pass through it, a

shaft di driven by one of said gears, a chuck, and gearing coniprising the toothed member 3S for driving said chuck.

In a rock drilha cylinder, a piston in said cylinder, said piston having a head and torward and rearward extensions, a chuck having an opening tor receiving said torward extension ot said piston, external gear teeth on 4said chuck, an internally toothed yoke surrounding said chuck and meshing vith said xternal gear teeth, and a motor for operating said yoke and surrounding said rearward extension ot said piston.

30. In ay rock drill, a cylinder', a piston in said cylinder, said piston having a head and forward and rearward extensions, a chuck having an opening for receiving said forward extension ot said piston, external gear teeth on said chuck, an inter ally toothed yoke surrounding said chuck and meshing with said external gear teeth, eccentrics for operating said yoke, a motor tor `actuating said eccentrics, and said motor surrounding said rearward extension ot said piston.

31. In a rock drill, a cylinder, a piston in said cylinder, said piston having a rearward extension, a motor surrounding said extension, a chuck, a gyratory member for driving said chuck, and means for causing said motor to actuate said gyratory member.

3Q. In a rock drill, a cylinder, a piston in said cylinder, said piston having a rearward extension, a motor surrounding said eXtension, a chuck, a gyratory member for driving said chuck, an eccentric member for actuating said gyratory member,y and means for transmitting the power ot said motor to said eccentric member.

In a rock drill, a cylinder, a piston in said cylinder, said piston having a rearward extension, a motor surrounding said extension, a chuck, oppositely disposed cccentrics driven by said motor, a yoke mounted on said eccentrics, and said yoke carrying gear teeth meshing with gear teeth carried by said chuck.

3a. A rock drill ot' the hammer type having a reciprocating piston, a chuck anda motor delivering unidirectional motion for rotating said chuck, said piston having a head and a rearward extension, a cylinder tor said piston, said cylinder being exteriorly reduced adjacent said rearwardly extension of said piston, a rearward facing shoulder on said cylinder at the forward end oi the reduced portion ot said cylinder, a back head for said cylinder having a portion extending radially beyond the reduced ortion of said cylinder, and said motor bleing located between said extending portion of said back head and said rearwardly facing shoulder.

A rock drill of the hammer type having a reciprocating piston, a chuck and a motor delivering unidirectional motion for rotating` said chuck, said piston ,having a head and a rearward extension, said cylinder having` a section for said head and a section tor said extension, the section for said extension having a flange and a reduced dianii eter portion, a casing :tor said motor abut-- ting said tlange, and a common back head for said cylinder and said casing.

3G. A rock drill of the hammer type 4having a reciprocating piston, a chuck and a motor delivering` unidirectional motion for rotating said chuck, said piston having a head and a rearward extension, a cylinder having a cylinder section provided with a bore for said head, saidvcylinder having a separate cylinder section provided with a bore for said rearward extension, said separate cylinder section being of smaller crosssection than said first mentioned cylinder section, and having formed thereon a rearwardly facing shoulder, said motor for rotating said chuck being located behind said shoulder exteriorly of said separate cylinder` section and having a casing carried by separate cylinder section, and means roi: holding` said cylinder sections in assembled relation.

37. A rock drill having a chuck. a hainmer piston and motor tor driving said chuck, said hammer piston havingl a head and a rearward extension, said cylinder having bores receiving said head and rearward esitension of said piston, said cylinder being ot reduced cross-section exteriorly ot said ef;- tension and having a rearwardly facing shoulder at the forward end o' the portion of reduced cross-section, said motor for rotating said chuck being located at the por-l tion of reduced cross section behind said shoulder, and a gyratory member geared to said chuck and driven by said motor.

3S. In a motor, a cylinder having a small bore and a larger bore, a piston having portions fitting said bores, conduit means for admitting fluid to Vone ot said bores, conduit means controlled by said piston tor transferring such fluid to the other oi said bores, and other conduit means for admitting fluid to the same bore as the lirst conduit means when the second conduit means is operating, n

39. In a motor, a cylinder having a small bore and a larger bore, a piston having portions itting said bores, conduit means for supplying fluid to said small bore a conduit connecting said small bore to said largerV bore and controlled by said piston, and other conduit means controlled by said piston tor supplying fluid to said small bore when said passage is opened.

40. In a motor, a cylinder having a small bore and a larger bore, a piston having portions fitting said bores, conduit means for constantly supplying fluid to said small bore, a conduit connecting said small bore to said larger bore and controlled by said piston, and other con-duit means controlled by said piston for supplying, fluid to said small bore when said passape is opened.

All. In a motor havingv a cylinder and a piston providing' portions of small` and larger effective cross-sectional area, conduit means for admitting' fluid to one of said por tions, conduit means for transferring such fluid to the other of said portions, and other conduit means for admitting` fluid to the same portion as the rst conduit means when the second conduit means is operating.

42. In a motor having; a cylinder and a piston providing portions of small and larger eifectiye cross-sectional area, conduit means for supplying;l fluid to the portion of small area, a conduit connecting,- the last named portion to the other portion and .controlled by the piston, and other conduit means adapted to be controlled by piston for supplying fluid to said small portion when said passa-ge is opened.

d3. ln a motor having` cylinder and a piston providing portions of -small and larger effective cross-sectional area, conduit means for constantly supplyingl iiuid to the portion of small area, a conduit connecting the last named portion to the other portion and controlled by the piston, and other conduit means controlled by said piston for supplying` fluid to said small portionwhen said passage is opened.

ile. in apercussive motor for drill steels, a piston haring` a head and an extension, a cylinder for said piston, a source of motive fluid supply, and a pair of spaced ports connecting' said source to the cylinder portion for said extension and controlled by sai-d extension to admit fluid from one port to one side of said head and from the other port to the opposite side of said head.

45. In a percussive. motor for drill steels, a piston haring; a head and an extension,r a cylinder for said piston, a source of motive fluid supply, a pair of spaced ports'connecting said source to the cylinder portion for sai-d extension and controlled by said extena sion to admit Huid from one port to one side of said head and from the other port to the opposite side of said head, and means for admitting fluid and causing it to act constantly on the end of said extension.

46. ln a motor, a cylinder, a piston in said cylinder, said piston having portions of snail and larger effective cross-sectional area, conduit means for supplyingiluid to actcontinnously on the portion of' small area, a conduit connectingl the last named portion to the other portion and adapted to he controlled by the piston, and other conduit means adapted to be controlled by said piston for supplying fluid to said small portion When said passage is opened.

a7. ln a percussive motor for drill steels,

a vpiston having` the portions l and a. cylii der for said portions, passages i and il openino into the bore of the cylinc er fo tho portion 3, the passages l0 leas inc` to the end of the cylinder bore for the portion l, and said portion 3 placing sai-d passages into communication 1when the piston is at one end of its stroke.

48. In a drilling' machine, a cylinder, a piston therein, said cylinder and pi *ton forming a chamber, a source of motive fluid, conduit means lor constantly supplying` said chamber with motive fluit. from said source, a chuck, a chuck rotating motor having an intake, and conduit means for uninterruptedly supplying motive fluid from said chainber to said intake.

49. in a drilling machine, a cylinder, a piston therein, said cylinder and piston forming* a differential piston chamber, a source of motive fluid, conduit means for constantly supplyingl said chamber with motive fluid from said source, a chuck, a chuck rota-tingmotor haif'ing an intake, and duit means for uninterruptedly supplying` motive fluid from said chamber to said intake.

50. l'n drilling machine, a cylincer, a piston the-rein, said cylinder and piforming` a chamber, means -for constai'itly U5 supplyingl said chamber With motive flii'ia chuck, a chuck rotating motor havirr intake and surroundingsaid chamber, conduit means connecting said chamber and intake. MLU

5l. ln a drilling machine, a cylinder, e piston therein, said cylinder and pif* n forming a chamber, a source ofmotive conduit means for constantly supplyin chamber With motive fluid from shid soi titl ten

05 chu'cii, a chuck rotating' motor hav intake and located adjacent and conduit means for uninte. plying motive fluid Jfrom sait said intake. U

in a drillinon'iacl' piston therein, iid c,y forming a chamber, a for rota-.ting` steel ai l iis take, means for admitting cha iber to act conti i pressure area of said pi uninterruptedly conduct l from said chamber to se d in 53. ln a drilling macl*` therein, said l l steel, rotary engine tor and haring an intake, soi fluid, conduit means pro eon'imunication between said said intake, and said conduit means includingv said expansible chamber.

f l 'ling machine, a cylinder, a

ad. in dnl piston therein, aid cylinder and piston forming a differential piston chamber, means tor supplying paid chamber With pressure fluid and causing it to act continuously on said piston, a chuck rotating motor luiving an intake, and conduit means t'or uninterruptedly supplying motive fluid troni chrfimher to said intakev In a drilling` maehire, a piston having a head and an eftension, a cvlinder having hores for iid head and e 'nsion, a drill steel, a motor ii'or rotating said Vsteel and ln ving an intake, a sorree of motive linie, cendui t means connectii'ig said source with the here tor said extension, and conduit means :lor i2 interruptedly supplying said vintake with motive Huid iroin named iore.

56. In a drilling macl'iine, a piston hau'- ing a head and an enten ion, a cylinder having hores for said head and et nsion, a

drill steel, a motor for ro'at' i steel and having an intake, means :lci admitting motive fluid from a source bore ior said extension :tor ai ously on the rear 'ard end of s' if i means Yl'or admitting said niet' 'e 'fluid from said here for said extension to ie here for said head, and means for sul'iplying motive 'luid iuiinterruptedly from the rearward end ot said here t'or said extension to said intake.

5T. In a drilling machine, a piston having the portion 3, a cylinder forming with said portieri the expansihle chamber et, a drill steel, a motor ior rotating said steel and having an intake, the passage uninterruptedly connecting said chamber to said intake, and conduit i'neans independent oi' said passage 25 tor constantly supplying said chamber a with motive fluid.

58. In a drilling machine, a pereussive motor having a cylinder and piston, said cylinder and piston forming a chamber, means ter constantly admitting iiuid to said chamber, a chuck rotating motor having an intake, conduit means connecting said chamber and intake, an exhaust discharge conduit for said percussive motor, and means for rendering said exhaust discharge conduit inoiiierative while permitting an admission et 'fluid to said chamber.

59. In a drillingl machine, a percussive motor having a cylinder and piston, said cylinder and piston forming a chamber, means tor constantly admitting fluid to said chamber, a chuck rotating motor having an intake, conduit means coimcctingsaid chamber and intake,I an exhaust discharge conduit for said percussive motor, conduit means leading to the Work and connecting with said exhaust discharge conduit, and means tor rendering said exhaust discharge conduit inoperative to discharge exhaust and simultaneously to supply fluid thereto to the .i tinu- While permitting an admission of fluid to said chamber.

Y (SO. In a drilling machine, a cylinder, a piston therein, said cylinder and piston forming a chamber, means for constantly supplying said chamber With motive fluid, a chuck, a chuck rotating motor having an intake, conduit means connecting said chamber and intake, and means `for rendering said piston inoperative While permitting a supply to said chamber.

6l. In a drilling machine, a cylinder, a piston therein, said cylinder and piston forming a differential piston chamber', means for constantly supplying said chamloer With motive fluid, a chuck, a chuck ro tating motor having ar intake, conduit means connecting said chamber and intake, and means for rendering said piston inoperative lWhile permitting a supply to said chamber. r

62. In a drilling n'iachine, a percussive motor having a piston and cylinder and an exhaust discharge, said piston and cylinder forming a clnmiher, a chuck rotating motoi having an intake, a conduit connectingl said intake and chamber, and coordinated controll' means providing in one position there i supply of motive fluid to said champermitting the operation ot said her and exhaust discharge and in another position thereot to provide a supply ot' motive iiuid to said chamber and While rendering said exhaust discharge inoperative.

63. In a drilling machine, a percussive motor having a piston and cylinder and an exhaust discharge, said piston and cylinder forming a chamber, a chuck rotating motor having an intake, a. conduit connecting said intake and chamber, coordinated controlling means permitting .in one position thereotl the operation of said exhaust discharge and in another position rendering said exhaust discharge inoperative While supplyingl motive fluid to said chamber in both positions and to the exhaust discharge in the second position, and conduit means connecting said exhaust discharge to the Work. i

G4. In a drilling machine, a drill steel ro tating motor having an intake, a hammer motor having an intake and an exhaust, means providingr for the simultaneous connection o'l the intakes of hoth'motors to a source of motive :fluid supply, and means for connecting the exhaust of said hammer motor to said source Without interrupting the supply to said intakes.

65. In a drilling machine, a drill steel ro tating,` motor, a hammer motor, means for supplying pressure fluid from a source of pressure fluid to said hammer motor` and hence to said drill steel rotating motor, and means for connecting the exhaust discharge conduit of said hammer motor to said source .lli

Without interrupting the supply to said hammer motor.

66. In a drilling machine, a drill steel rotating motor, a hammer motor, means for sup )lying presure fluid from a source of motive fl id to said hammer motor and hence to s drill steel reta-ting motor, an exhaust discharge conduit means leading to the atmosphere for discharging the exhaust of said hammer motor, means connecting said ccnduit means to the Work, and means for connecting said exhaust discharge conduit means to said source of pressure fluid Without interrupting the supply to said hammer motor.

67. ln a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, an independent motor for rotating the drill steel, means for supplying said independent motor With motive iuid conducted through said intake, and means for at Will optionally connecting to said source either said intake alone or both said intake and exhaust.

68. ln a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, an independent motor for rotating said drill steel, said independent motor being supplied with pressure fluid passing through said intake, a connection between said percussive motor and the Work, and means for at Will optionally connecting to said source either said intake alone or both said intake and exhaust.

69. In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, conduit means for conducting pressure fluid from said motor to the drill hole, an auxiliary motor for rotating said drill steel operated by pressure fluid passing through said intake, and means for at Will optionally connecting to said source either said intake alone or both said intake and exhaust and in both instances without interrupting the exhaust of said auxiliary motor.

T0. ln a percussive motor for drill steels, a. source of pressure fluid supply, an intake for said motor, a chuck having a chamber, a conduit connecting said chamber to the atmosphere, a drill steel having a bore in communication With said chamber, and means for at Will optionally connecting to said source either said intake or both said intake and conduit.

7l. ln a percussive motor for drill steels, source of pressure fluid supply, an intake and an exhaust for said motor, a chuck having a chamber, a conduit connecting said chamber to said exhaust, a drill steelhaving a bore in communication with said chamber, and means for at Will optionally connecting to said source either said intake or both said intake and exhaust.

ln percussive motor for drill steels, a source of pressure fluid supply, an intake for said motor, an auxiliary motor having an intake and exhaust', the intake of said auxiliary motor being supplied from the intake of said percussive motor, a chuck having a chamber, a conduit connecting` said chamber to the atmosphere, and means for at will optionally connecting to said source either said intake of said percussive motor or both said intake of said percussive motor and conduit and in both instances Without interrupting the exhaust of said auxiliary motor.

T3. in a percussiveI motor for drill steels, a source of pressure fiuid supply, an intake and an exhaust for said motor, an auxiliary motor having an intake and exhaust, said intake of said auxiliary motor being supplied With pressure fluid from the intake of said percussive motor, a chuck having a chamber, a conduit connecting said chamber to said exhaust of said percussive motor, and means for at will optionally connecting to said source either said intake of said pei cussive motor alone er both said intake and exhaust of said percussive motor and in both instances Without interrupting the exhaust of said auxiliary motor.

Ti. in a percussive motor for drill steels, a source of pressure fluid supply, intake and exhaust conduits for said motor, a hollow drill steel having its bore in permanent communication with the exhaust conduits, and coordinated valvular means for at will optionally connecting to said source either said intake conduit alone or both said intake and exhaust conduits.

In a percussive motor for drill steels, a source of pressure fluid supply, intake and exhaust conduits for said motor, conduit means for permanently connecting the exhaust conduit to the drill hole, and coordinated valvular' means for at will optionally connecting` to said source either said in takealone or bot-h said intake and exhaust.

'76. In a percussive motor for drill steels,

a source of pressure fluid supply, an intake v and an exhaust for said motor, conduit means for permanently connecting the haust conduit to the drill hole, an auxiliary motor having its intake supplied With pressure fluid from the intake of said percussive motor, and coordinated valvular means for at Will optionally connecting to said source either said intake of said percussive motor or both said intake and exhaust of'said percussive motor and in each instance Without interrupting the exhaust of said auxiliary motor.

77. In a percussive motor for drill steels, a source of pressure fluid supply, an intali'e for said motor, a chuck having a chamber. a drill steel having a bore in communication with said chamber, a conduit connecting said chamber to the atmosphere, and coordinated valvular means for at Will optionally conlOl) isa

nei'ting to said source either' said intake alone or both said intake and conduit.

In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, a chuck havingl a chan'iber, a conduit permanently connccting said chamber to said exhaust, and coordinatet valvular means for at will optionally connetinsy; to said source eitheiI said intake or both said vintake and exhaust.

TS). ln a perci sive motor for drill steels, a source of pressure fluid supply, an intake -tor said motor, an auxiliary motor supplied with pressure iluid from said intake, a chuck having a chamber, a conduit connecting said chamber to the a'tniopshere, and coordinated lvalvular means for at will optionally connetting` to said source either said intake or both said intake and conduit and in both instances without interrupting the exhaust of said auxiliary motor.

80. In a percussive motor for drill steels, a. source of pressure fluid supply, an intake and an exhaust for said motor, an auxiliary motor supplied with pressure fluid from said intake, a chuck having' a chamber, a conduit connecting' said chamber to said exhaust, and coordinated valvular means for at will optionally connecting to said source either said intake or both said intake and'exhaust and in hoth instances without interrupting the exhaust of said auxiliary motor.

8l. In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, and a single valve for at will optionally connecting to said source either said intake for causing said motor to operate or both said intake and exhaust for causing said motor to cease operation.

l82.l In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, means for conducting exhaust pressure fluid from said motor to the drill hole, and a single valve forat Will optionally connecting to said source either said intake for causing said motor to operate and the drill hole to be suppliedor 'both said intake and exhaust for causing rsaid motor to cease operating and the drill hole to be supplied.

83. In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, conduit means supplying pressure fluidfrom said motor to the drill hole, an auxiliary motor supplied with pressure fluid from said intake, and a single valve for at Will optionally connecting to said source either said intake or both said intake and exhaust and in both instances Without interrupting the exhaust of said auxiliary motor.

84. In a percussive motor for drill steels, a source of pressure fluid supply, an intake for said motor, a chuck having a chamber, a

conduit connecting said chamber to they atmosphere independently of the drill hele,

and a single valve for at will optionally connecting to said source either said intake or both said intake and conduit.

85. In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaust for said motor, a chuck having a chamber, a conduit connecting said chamber to said exhaust, and a single valve for at Will optionally connecting to said source either said intake or both said intake and exhaust.

86. In a percussive motor for drill steels, a source of pressure fluid supply, an intake for said motor, an anxiliary motor supplied with pressure fluid from said intake, a chuck having a chamber, a conduit connecting said chamber to the atmosphere, and a single valve for at Will optionally connecting to said source either said intake or both said intake and conduit and in both instances Without interruptingthe exhaust of said auxiliary motor.

87. In a percussive motor for drill steels, a source of pressure fluid supply, an intake and an exhaustfor said motor, an auxiliary motor supplied with pressure fluid from said intake, a chuck having a chamber, a conduit connecting said chamber to said exhaust, and a single valve for at Will optionally connecting to said source either said intake or both said intake and exhaust and in both instances Without interrupting the exhaust of said auxiliary motor.

88. In a drilling machine, a percussive motor, a motive fluid supply connection, an intake for said percussive motor, a chuck carrying ahollow drill steel, the passage 46 in communication with the interior of said chuck, andthe valve 49 for connecting the passage 46 Veitherrto the atmosphere or to said motive luid supply connection.

89. In a drilling machine, a percussive motor, almotive fluid supply connection, an intake for said percussive motor, a chuck carrying a hollow drill steel, a motor for rotating said chuck and having the intake port 26, the passage 46fin communication with the interior of said chuck, and the valve 49 for connecting the passage 46 either to the atmosphere or to said motive fluid supply connection and in each case connecting the intake for said percussive motor to said motive fluid supply connection.

QOi-Iny a drilling machine, a cylinder, a piston therein, said piston having an extending portion, a chuck rotating motor comprising a rotary member for converting the energy of pressure fluid into Work surrounding-said portion, and means including a conduit surrounded by said rotary member for supplying motive fluid` to operate said piston.

91. In a motor, a piston having a head and lUO an extending portion, a cylinder having a section providing a bore for said head portion, a closure `for said bore comprising a cylinder section having a wall forming a bore for said portion, a chuck rotating motor comprising a rotary member for converting the energy of pressure fluid into work surrounding said wall, and means including a conduit formed in said wall for supplying motive fluid to operate said piston.

92. ln a drilling machine, a cylinder, a piston in said cylinder, said piston having a head and a rearward extension of reduced diameter, a motor having an annular external gear surrounding said rearward extension, a gear at the side of said extension meshing with said annular gear, a chuck, and reduction gearing operatively connecting one of said gears to said chuck.

93. ln a drilling machine, a cylinder, a

iston in said cylinder, said piston having a liead and a rearward extension of reduced diameter, a motor having an annular external gear surrounding said rearward extension, a gear at the side of said extension meshing with said annular gear, a shaft driven by said second gear, a chuck, and reduction gearing operatively connecting said shaft and chuck.

94e. In a drilling machine, a cylinder, a piston in said cylinder, said piston having a head and a rearward extension of reduced diameter, a motor having an annular eX-' ternal gear surrounding said rearward extension, a pair of gears meshing with said annular gear, said pair of gears being disposed at opposite sides of said annular gear, a shaft driven by one ofl said pair of gears, a chuck, and reduction gearing operatively connecting said shaft and chuck.

95. ln a drilling machine, a cylinder, a piston in said cylinder, said piston having a head and a rearward extension of reduced diameter, a motor having an annular external gear surrounding said rearward extension, a pair of gears meshing with said annular gear, said pair of gears being disposed at opposite sides of said annular gear, separate shafts driven by each of said p air of gears, a chuck, and reduction gearing operatively connecting said chuck and shafts'.

96. ln a rock drill, a drilling tool, a hammer and a motor for operating said tool, said motor having an intake and an exhaust and substantially continuously conducting motive fluid trom said intake to said exhaust for operation oit said motor, means for supplying motive fluid to said hammer and motor, and means for causing the hammer to impart energy to the motive fluid supplied the motor.

917. En a rock drill, a drilling tool, a hammer and a motor for operating said tool, said motor having an intake and an exhaast and substantially continuously conducting motive fluid from raid intake to said exhaust for operation of said motor, means for supplying motive fluid for operating said hammer, means for cushioning seid hammer by fluid pressure, and means for utilisingthe energy ot compression for operating said motor.

98. ln a. rock drill, a drilling tool, a hammer and a motor for operating said tool, said motor having an intake and an exhaust and substantially continuously conducting motive fluid from said intake to said exhaust for Operation ot said motor, means for supplying motive fluid for operating said hammer, and means 'for Converting the kinetic energy of said hammer into fluid pressure energy for operating said motor.

99. In a rock drill, a drilling tool, a hammer and a motor for operating said tool, said motor having` an intake and an exhaust and substantially continuously conducting motive fluid trom said intake to said exhaust for operation of said motor, means for supplying motive fluid to said hammer and motor and. means for causing the motive fluid supplied said hammer t0 augment the energy of the motive fluid supplied said motor.

100. In a rock drill, a drilling tool, a hammer and a motor for operating said tool, said motor having` an intake and an exhaust and substantially continuously conducting motive fluid from said intake to said exhaust for operation of said motor, means providing a pressure area for said hammer and an opposed pressure area, means for admitting fluid to said areas and for causing that acting on one of said areas to move the hammer to compress the fluid behind to the other, and means for conducting such compressed fluid to said motor.

lOl. In a rock drill, a drilling tool, a hammer and a motor for operating said tool, means providing a pressure area and relatively larger opposed presure area for said hammer, cylinder portions for said areas, a motive fluid supply, means for connecting the cylinder portion :tor said first named area to said supply and eiifective to restrict return flow, means for intermittently connecting the cylinder portion for said opposed area to said supply, and a normally permanently open connection from the cylinder portion for the first named area to said motor.

102. In a rock drill, a drilling tool, a hammer for operating said tool, said hammer having a smaller and a larger diameter portion, a cylinder for said hammer, a source of motive fluid supply, a connection between said source and the cylinder including passages controlled by said smaller diameter portion for admitting fluid to said cylinder to act on said larger diameter porlll) tion, a connection controlled by said smaller diameter portion for compressing motive fluid, a motor for actuating said tool, and a normally permanently open connection for conducting such compressed fluid to said motor for operating it.

103. In a rock drill, a drilling tool, a motor for operating said tool7 said motor having an intake and an exhaust and subn stantially continuously conducting motive fluid Jfrom said intake to said exhaust for operation of raid u'wtor, a hammer for operating said'tool and having opposed surfaces, means for causing motive fluid to act on said surfaces for reciprocatingr said hammer,

a plunger conne/tedto reciprocate with' :raid hammer, and means for causing said plunger to compress motive `fluid for operating' sa id motor.

104. In a rock drill, a drill steel, a hammer having an intermittent larger pressure surface/and an opposed pressure surface in constant and restricted communication with a source offmotiye Huid, a cylinder having a. portion providing an abutment for said opposedsurface, a rotary motorV for rotatingf abutment :for said forwardly actin surface, a rotary motor for rotating sai steel,

and a motor supply connection from said cylinder portion to said motor.`

In testimony whereof, I have signed my namento .this` specification.

GEORGE GILMAN. 

